I keep mine for 1-2 years. It's well packaged, and the deep freeze isn't opened more than once or twice a week. If it looks raunchy when I thaw it, I throw it out, but you'd be surprised how long some things will last
On the other hand, I found a venison roast from '03 the other day, and threw it in the crockpot, thinking it would be OK cooked that way. There was no freezer burn on the meat, but when I cooked it, it had gotten a strong taste. My husband went ahead and ate a sandwich, gave some to the dog, then threw the rest away. It wasn't spoiled, it just tasted funky. The dog thought it was great.
We get by with a little help from our friends